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blastula 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˈblasCHələ/,
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blastulae, plural; blastulas, plural;
  1. An animal embryo at the early stage of development when it is a hollow ball of cells

  1. early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
  2. The blastula (from Greek βλαστός (blastos), meaning "sprout") is an early stage of embryonic development in animals. It is also called blastosphere. ...
  3. An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere
  4. A ball of cells surrounding a fluid-filled cavity (the blastocoel) that is produced by the repeated cleavage of a zygote. PICTURE
  5. The hollow ball of cells marking the end stage of cleavage during early embryonic development.
  6. an early stage of embryonic development where the embryo consists of a hollow ball of cells prior to gastrulation. It is from this stage that embryonic stem cells are isolated.
  7. a cleavage stage embryo, typically a hollow ball of cells surrounding a cavity called the blastocoel; this term is used for (among others) echinoderm and amphibian embryos.
  8. An early animal embryo formed by the first few cleavages after fertilization. Often a thin sheet or hollow ball of cells.
  9. In animals, an early embryo form that follows the morula stage; typically, a single-layered sheet (blastoderm) or ball of cells (blastocyst).